Here's an Ask the Expert page that addresses this that you may find helpful: www.sparkpeople.com/community/ask_the_expe rts.asp?q=49 . In short though, sweating is not a good indicator of how many calories you are burning, is more about increasing your heart rate and how many muscles you are using when working out. If you are isolating one muscle in strength training, you are not likely to increase your heart rate as much as cardio and you are working the one muscle, compared to the numerous muscles being worked during cardio.
How come you burn less calories when strength training than you burn doing cardio. Strength training you are working out harder and sweating more than cardio. Although I sweat quite a bit in a cardio workout it's not nearly as much as it is when I strength train.
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